Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
95.3
97
90
91
97
97
February
92.1
85
89
96
99
92
March
87.9
80
88
88
91
85
April
89.2
84
83
84
95
97
May
87.7
86
83
77
90
June
86.4
88
83
93
77
July
87.6
82
89
94
82
August
94.0
90
97
84
96
September
93.8
99
85
94
93
October
98.1
98
98
100
94
November
97.0
99
99
99
94
December
97.3
95
96
100
100
Average
91.4
85.8
90.1
90.0
93.0
91.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.